'use strict';

const semver = require('semver')
const colors = require('colors/safe')
const log = require('@tangmen-cli-dev/log')

const LOWEST_NODE_VERSION = '12.0.0'

class Command {
    constructor(argv) {
        if (!argv) {
            throw new Error('参数不能为空')
        }
        if (!Array.isArray(argv)) {
            throw new Error('参数必须为数组')
        }
        if (argv.length < 1) {
            throw new Error('参数列表为空')
        }
        this._argv = argv
        let runner = new Promise((resolve, reject) => {
            let chain = Promise.resolve()
            chain = chain.then(() => this.checkNodeVersion());
            chain = chain.then(() => this.initArgs());
            chain = chain.then(() => this.init());
            chain = chain.then(() => this.exec());
            chain.catch(err => {
                log.error(err.message)
            })
        })
    }

    // 初始化参数
    initArgs() {
        this._cmd = this._argv[this._argv.length - 1]
        this._argv = this._argv.slice(0, this._argv.length -1)
    }

    // 检查node版本
    checkNodeVersion() {
        const currentVersion = process.version
        const lowestVersion = LOWEST_NODE_VERSION
        if (!semver.gte(currentVersion, lowestVersion)) {
            throw new Error(colors.red(`tangmen-cli 需要安装${lowestVersion}版本及以上的Node.js`))
        }
    }

    // 交给子类去实现
    init() {
        throw new Error('init必须实现！');
    }

    // 交给子类去实现
    exec() {
        throw new Error('exec必须实现！');
    }

}

module.exports = Command
